Here is Standard IV from the New Educator Evaluation System which directly addresses collaboration with colleagues.
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This is an excellent article on why collaboration and coteaching benefits ELLs. It also gives examples on the what and how of coteaching:
Collaborative Practices to Support ALL Students

This is an excellent website with great reading and resources on Collaborating and Coteaching. The site is maintained by Andrea Honigsfeld and Maria G. Dove:

Collaborating and Coteaching

Recommended Text:

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